package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.time.LocalTime;

/**
 * @BelongsProject: sky-take-out
 * @BelongsPackage: com.sky.aspect
 * @Author: zhouzhijie
 * @CreateTime: 2023-11-12  23:05
 * @Description: 自定义切面，实现公共字段自动填充处理逻辑
 * @Version: 1.0
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * @description: 切入点
     * @author: zhouzhijie
     * @date: 2023/11/12 23:12
     * @param: []
     * @return: 
     **/
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * @description: 前置通知，在通知中进行公共字段的赋值
     * @author: zhouzhijie
     * @date: 2023/11/12 23:17
     * @param: [joinPoint]
     * @return: 
     **/
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段的自动赋值");
        //获取到当前被拦截方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型
        //获取到当前被拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args ==null||args.length==0){
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射赋值
        if (operationType==OperationType.INSERT){
            //为四个公共字段赋值
            try {
                Method setCreatTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过放射为对象属性赋值
                setCreatTime.invoke(entity,localDateTime);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }else if (operationType==OperationType.UPDATE){
            //为两个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过放射为对象属性赋值
                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }


    }
}
